Expandable ablation burr
First Claim
1. A device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
- a drive shaft;
an ablation burr secured to the drive shaft, the ablation burr comprising a polymeric tube section, the polymeric tube section being expandable from an unexpanded state with a first diameter to an expanded state with a second larger diameter, the polymeric tube section having an abrasive coating disposed on at least a portion of its exterior surface to ablate an occlusion in a patient'"'"'s vessel; and
an expansion control system to control the expansion of the burr to a predetermined expanded diameter when in the expanded state.
1 Assignment
0 Petitions
Accused Products
Abstract
An atherectomy burr has an operating diameter that is larger than the diameter of a catheter in which the burr is routed. The burr may include a polymeric balloon that is coated with an abrasive and that expands when the burr is rotated. When the burr is rotated, the polymeric tube expands by centrifugal force. The maximum expansion of the burr is controlled by an expansion mechanism. Various mechanisms are disclosed for controlling the maximum diameter of the burr thus preventing the burr from over expanding. In addition, the present invention includes a system for preventing the loose ablated particulate from reembolizing in the distal vasculature. The system includes an ablation burr that has abrasive disposed on the proximal end that is pulled back toward the guide catheter to ablate the lesion. The burr creates a seal when expanded to block the ablated particulate so that the aspiration system can remove the particulate from the patient vessel or stent. Alternatively, the burr system may include a self expanding seal that is deployed out of the aspiration sheath so that a slight vacuum can remove the large loose particulate form, the patient'"'"'s vessel or stent.
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Citations
31 Claims
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1. A device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
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a drive shaft;
an ablation burr secured to the drive shaft, the ablation burr comprising a polymeric tube section, the polymeric tube section being expandable from an unexpanded state with a first diameter to an expanded state with a second larger diameter, the polymeric tube section having an abrasive coating disposed on at least a portion of its exterior surface to ablate an occlusion in a patient'"'"'s vessel; and
an expansion control system to control the expansion of the burr to a predetermined expanded diameter when in the expanded state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 29, 30)
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11. An device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
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a drive shaft;
an ablation burr secured to the drive shaft, the burr including a nose section having a fixed maximum diameter and an expandable polymeric section having an abrasive disposed on at least a portion thereof, the polymeric section having a diameter that increases as the rotational speed of the drive shaft increases;
wherein the polymeric section includes a system that limits the expansion of the burr to a predetermined maximum diameter. - View Dependent Claims (12, 13)
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14. A reverse pull-back device for ablating a lesion in a patient'"'"'s blood vessel or stent, comprising:
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a drive shaft;
an ablation burr secured to the drive shaft, the ablation burr comprising a polymeric balloon section, the polymeric balloon section having an unexpanded state with a first diameter and an expanded state with a second larger diameter, the polymeric balloon section having an abrasive coating disposed on at least a portion of its exterior surface to ablate a lesion in a patient'"'"'s vessel or stent;
wherein the balloon section is expandable to create a seal with the vessel or stent when in the expanded state. - View Dependent Claims (15, 16, 17, 18)
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19. A method for ablating a lesion or occlusion in a patient'"'"'s vessel or stent comprising:
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routing an ablation burr in an unexpanded state over a guide wire to a position distal to the lesion;
rotating a drive shaft to begin the expansion of the ablation bur;
pulling the ablation burr in an expanded state proximally toward to the lesion;
ablating the lesion with the ablation burr as the ablation burr passes through the lesion. - View Dependent Claims (20, 21, 22)
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23. A method for ablating a lesion in a patient'"'"'s vessel or stent with the use of a reverse pull-back ablation system, the ablation system comprising a drive shaft, an aspiration catheter disposed around the drive shaft, and an ablation burr secured to the drive shaft, the ablation burr comprising a polymeric balloon section, the polymeric balloon section having an unexpanded state with a first diameter and an expanded state with a second larger diameter, the polymeric balloon section having an abrasive coating disposed on at least a portion of its exterior surface to ablate a lesion in a patient'"'"'s vessel or stent, and a lumen extending through the drive shaft and ablation burr for receiving a guide wire, the method comprising:
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routing the ablation burr in an unexpanded state over the guide wire to a position distal to the lesion;
rotating the drive shaft to begin the expansion of the ablation bur;
pulling the ablation burr in an expanded state toward a position proximal to the lesion; and
ablating the lesion with the ablation burr as the ablation burr passes through the lesion. - View Dependent Claims (24, 25, 26, 27)
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28. A reverse pull-back device for ablating a lesion in a patient'"'"'s blood vessel or stent, comprising:
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a drive shaft;
an ablation burr secured to the drive shaft, the ablation burr comprising a polymeric balloon section, the polymeric balloon section having an unexpanded state with a first diameter and an expanded state with a second larger diameter, the polymeric balloon section having an abrasive coating disposed on at least a portion of its exterior surface to ablate a lesion in a patient'"'"'s vessel or stent; and
an aspiration catheter disposed around the drive shaft to remove the ablated material from the lesion. - View Dependent Claims (31)
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Specification